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Reverse Performance Characteristics of Main Mine Fans.

PB84143726

Publication Date	1983
Personal Author	Dunn, M. F.; Bhattacharya, S.; Rajaram, V.
Page Count	66
Abstract	During a mine fire or other emergency, it may be desirable to reverse the airflow in order to provide an escapeway or to isolate a fire. Also, in colder areas, the airflow may be reversed to prevent ice buildup. When reversing main mine fans, the mine operator usually does not know what operating characteristics of flow and pressure to expect. Laboratory and field tests of vane-axial main mine fans in the 7- to 9-ft-diam size range were conducted to establish forward and reverse performance characteristics under controlled conditions and at typical mine installations. The data obtained suggest that reverse performance characteristics are dependent upon the blade angle and the hub-to-tip ratio. There is also evidence that reverse performance can be predicted for a family of blade angles and a given hub-to-tip ratio. Generally, quantity of air is 30% to 65% less in reverse than when operating in the normal forward mode.
Keywords	Mine ventilation Ventilation fans Vaneaxial fans Air flow Mine fires Field tests Mine safety Reverse flow
Source Agency	Bureau of Mines
NTIS Subject Category	48A - Mineral Industries
Corporate Authors	Engineers International, Inc., Westmont, IL.; Bureau of Mines, Washington, DC.
Document Type	Technical Report
Title Note	Open file rept. 23 Jan 81-15 Jun 83.
NTIS Issue Number	198408
Contract Number	J0308044

Reverse Performance Characteristics of Main Mine Fans.

Reverse Performance Characteristics of Main Mine Fans.
PB84143726

Publication Date	1983
Personal Author	Dunn, M. F.; Bhattacharya, S.; Rajaram, V.
Page Count	66
Abstract	During a mine fire or other emergency, it may be desirable to reverse the airflow in order to provide an escapeway or to isolate a fire. Also, in colder areas, the airflow may be reversed to prevent ice buildup. When reversing main mine fans, the mine operator usually does not know what operating characteristics of flow and pressure to expect. Laboratory and field tests of vane-axial main mine fans in the 7- to 9-ft-diam size range were conducted to establish forward and reverse performance characteristics under controlled conditions and at typical mine installations. The data obtained suggest that reverse performance characteristics are dependent upon the blade angle and the hub-to-tip ratio. There is also evidence that reverse performance can be predicted for a family of blade angles and a given hub-to-tip ratio. Generally, quantity of air is 30% to 65% less in reverse than when operating in the normal forward mode.
Keywords	Mine ventilation Ventilation fans Vaneaxial fans Air flow Mine fires Field tests Mine safety Reverse flow
Source Agency	Bureau of Mines
NTIS Subject Category	48A - Mineral Industries
Corporate Authors	Engineers International, Inc., Westmont, IL.; Bureau of Mines, Washington, DC.
Document Type	Technical Report
Title Note	Open file rept. 23 Jan 81-15 Jun 83.
NTIS Issue Number	198408
Contract Number	J0308044